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> Just a few weeks ago I got interested in this as well ("where does FR24 get its data from?"). I ended up buying a cheap RTL-SDR dongle (R820T2) and a small outdoor antenna. I run the free dump1090 tool (I'm on Fedora) to decode ADS-B messages, then my own simple "radar-like" visualization program ([1]) connects to dump1090's network socket to receive decoded data (SBS1 textual format). Even with the antenna just sitting in my room (on a photo tripod), I typically receive data from 10-20 aircraft, up to 190 km away. I drove to a hilltop this weekend (some 600 m higher) and immediately got >100 aircraft, up to 500 km.
> [1] https://github.com/GreatAttractor/plane-tracker
I see your use of rust, and I have to mention I have a Rust ADS-B decoder and TUI radar application myself: github.com/rsadsb/adsb_deku/
This is cool in concept, but FlightRadar24 has a built-in Augmented Reality feature that works really well.
https://www.flightradar24.com/blog/show-us-your-best-augment...
Also, if I were to build my own local copy, I'd use an RTLSDR to get the ADSB packets direct and base my app on tar1090. https://github.com/wiedehopf/tar1090
> All the UIs we have for sky-watching now have moved away from that
Check out [SkyMap](https://github.com/sky-map-team/stardroid)!